Dry-shaving apparatus



Feb. 19, 1946.

J. SCHWAB DRY SHAVING APPARATUS Filed Jan. 20, 1945 I Sghwab PatentedFeb. 19, 1946 Application January 20. 1945. Serial No. 573,708 InSwitzerland June 19, 1944 8 Claims.

This invention relates to a dry shaving apparatus of the type comprisinga rotating drum and therein a stationary cutting member supporting thedrum, both being provided with apertures, wherethrough must enter thehair which is to be cut, whereby the apertures of the cutting membercooperate with the moving apertures of the drum.

According to one feature of the invention, the apertures of the rotatingdrum are arranged in rows along helical lines and those of the cuttingmember are constituted by transversal slits which form acute angles withthe axes of the drum and of the cutting member and extend through theupper portion of the cutting member.

Preferably the apertures of the rotating drum have rectangular shape,whereof the long side is placed on a helical line, and the slits of thecutting member are arranged approximately at right angles with regard tosaid helical lines.

In a modification of said features, the acute angles between the slitsof the cutting member and the axis diminishes from one side of thesupporting portion of cutting member to the other.

Another feature of the invention is to provide the inner surface of therotating drum. along the apertures, with cutting edges.

With the foregoing and other features in view, the invention will bemore fully described hereinafter, and will be more particularly pointedout in the claims appended hereto.

In the drawing, which illustrates a preferred embodiment, of theinvention,

Fig. 1 is a frontal view of the dry shaving apparatus and I Fig. 2 is alateral view to Fig. '1.

Fig. 3 shows a longitudinal section through the apparatus along the axisof the drum.

Fig. 4 shows a cross section at a right angle to said axis of the drum.

The dry shaving apparatus comprises a twopart handle I, the two halvesof which are of essentially equal shape and are fixed together by ascrew connection 2. The top portion of the handle I presents acylindrical recess 3, wherein the drum 4 is so located that about onethird of the circumference of the drum is not enclosed and extendsbeyond the upper end of the handle I. The diameter of the cylindricalrecess 3 is a little bigger than the diameter of the drum 4, so that thelatter can easily rotate within said recess 3. The drum 4 has a verythin cylindrical wall wherein are provided rectangular apertures 4a,which are arranged in rows along helical lines. The drum wall isreinforced at each end by a stiifening ring 5. The cutting member 6 isva tubular body mounted upon lateral supports III of the 'handle I andextending coaxially through the drum 4 for supporting the latter frominside. The supporting surface I of the tubular body I5 is thereforemachined to correspond with the curvature of the inner drum surface,while the inner surface 8 of the tubular the recess 3 which partlyencloses the drum 4.

A flap cover II at each end of the tubular body 6 is mounted bythepivots I2 in the handle I and has a nose I3 which projects beyondpivots I2 into an annular groove I4 of a button I5. The two buttons I5are slidable in a bore I6 of the handle 'I and held apart by a spiralspring I1 10- cated therein, whereby the two covers I I are kept closed.In order to protect the rotating drum 4, when the apparatus is not used,a cap I8 having lateral slits I9 is pushed over the top portion of thehandle I and secured by means of these slits I9 at the buttons I5.

The manipulation of the dry shaving apparatus is the following: The capI8 is taken off. The apparatus is then seized with one hand at thehandle I and the drum 4 is brought into contact with the surface to beshaved. By moving the apparatus to and fro and simultaneously exerting aslight pressure upon said surface, the drum 4 is rotated due to thefriction between the drum 4 and the surface to be shaved. The hairenters through the apertures 4a into the slits 9 and is out off by theouter cutting edges along the slits 9 of the cutting member 6 inside therotating drum 4, as the apertures 4a of the drum 4 move across the ribsbetween the .slits 9 of the cutting member 6.

The apertures of the drum may have the shape of squares or rectangles orgeneral parallelograms or trapezoids and the edges inside along theseapertures are preferably bevelled. The helical lines, wherealong therows of apertures are arranged, should preferably cross the slits of thecutting organ approximately at a right angle. The slits in the cuttingorgan may follow curved lines, which form at one end a less acute angleprovided with a cylindrical recess in the top portion, a rotating drumpartly enclosed in said recess, a stationary cutting member extending Ythrough said drum and supporting the same, said drum and cutting memberbeing each provided with apertures, wherethrough must enter the hairwhich is to be cut, said apertures in the Jacket of said drum beingarranged in rows along helical lines, and said apertures in the cuttingorgan being constituted by transverse slits which extend through theupper portion of said cutting member and form acute angles with the axesof said drum and of said cutting member.

2. Dry shaving apparatus comprising a twopart handle provided with acylindrical recess in the top portion, a rotating drum partly enclosedin said recess, a stationary cutting member extending through said drumand supporting the same, in the cylindrical Jacket of said drum amultitude of apertures having the shape of parallelograms and beingarranged in parallel helical rows, and transverse slits extendingobliquely across the upper portion of said cutting member, so as to formapproximately right angles with said helical rows of apertures in saiddrum.

3. Dry shaving apparatus comprising a twopart handle having acylindrical recess in the top portion, a rotating drum partly enclosedin said recess, a stationary cutting member extending through said drumand supporting the same, in the cylindrical jacket of said drum amultitude of apertures having the shape of parallelograms which arearranged in parallel helical rows, whereby adjacent rows of aperturesare staggered to each other, and transverse slits extending obliquelyacross the upper portion of said cutting member, so as to formapproximately right angles with said helical rows of apertures in saiddrum and acute angles with the axes of'said drum and saidcutting-member.

4. Dry shaving apparatus comprising a twopart handle having acylindrical recess in the top portion, a rotating drum partly enclosedin said recess, a stationary tubular body extending coaxially throughsaid drum and supporting the same, in the cylindrical jacket of saiddrum a multitude of rectangular apertures arranged in rows, with theirlong sides along helical lines, and transverse cutting slits extendingobliquely approximately across the contacting portion of said tubularbody with said drum, thereby forming approximately right angles withsaid helical rows of apertures in said drum and acute angles with theaxes of said drum and said tubular body.

5. Dry shaving apparatus comprising two-part handle having a cylindricalrecess in the top portion, a rotating drum partly enclosed in saidrecess, a stationary tubular bod extending coaxially through said drumand supporting the same, in the cylindrical Jacket of said drum a topportion, a'rotating drum partly enclosed and axially guided in saidrecess, a stationary tubu lar body extending coaxially through said drumand supporting the same by means of a contact surface, the curvature ofwhich is equal to that of the interior surface of said supported drum,in the cylindrical jacket of said drum a multitude of rectangularapertures arranged in helical rows, said apertures getting smallerinwards, as the lateral surfaces around each aperture form acute anglesand edges with the above-mentioned interior surface of the jacket, andtransverse cutting slits extending obliquely at least across thecontacting portion of said tubular body with said drum, thereby formingapproximately right angles with said helical rows of apertures in saiddrum and acute angles with the axes of said drum and said tubular body.

7. Dry shaving apparatus comprising a twopart handle having acylindrical recess in the top portion, a rotating drum partly enclosedand axially guided in said recess, a stationary tubular body extendingcoaxially through said, drum and supporting .the same, a tumable flapcover at each end of said cylindrical recess, in engagement with saidtwo flap covers a spring actuated closing member, which is operableagainst the action of the spring for opening said covers, in thecylindrical jacket of said drum a multitude of apertures having theshape of parallelograms and being arranged in parallel helical rows, andtransverse. cutting slits extending obliquely at least across thesupporting portion of said tubular'body, thereby forming approximatelyright angles with said helical rows of apertures in said part handlehaving a'cylindrical recess in the top portion, a rotating drum partlyenclosed and axially guided in said recess, a stationary tubular bodyextending coaxially through said drum and supporting the same, aswingable flap cover at each end of said cylindrical recess, inengagement with said two flap covers a spring actuated closing member,which is operable against the action of the spring for opening saidcovers, in the cylindrical iacket of said drum a multitude of apertureshaving the shape of parallelograms and being arranged in parallelhelical rows, and curved transverse cutting slits extending from oneside of the supporting portion of the tubular body to the other, therebyforming at one end a less acute angle than at the other end with respectto the axes of said drum and of said tubular .body.

